Abstract
Cosmogenic stable nuclide, 45Sc, concentrations in Gibeon iron meteorite were determined by radiochemical neutron activation analysis. 45Sc concentration down to 0.0064 ppb was able to determined in this study. Blank value was estimated to be less than 0.001 ppb.45Sc concentrations in Gibeon were found to be highly correlated with 4He concentrations. It was consistent with the correlation observed in iron meteorites other than Gibeon meteorite. In Gibeon meteorite two different irradiation ages were observed using rare gas isotopes. In this study 8 fragments with different irradiation ages were analyzed. Systematic difference among 8 fragments was not found for the correlation between 45Sc and 4He. It was concluded that 2 different irradiation ages observed in Gibeon was not resulted from loss of rare gases from the body.
